Remove newly-added notification correctly in the message center

ui/message_center/views/message_list_view.cc

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "ui/gfx/animation/slide_animation.h"
 #include "ui/message_center/message_center_style.h"
@@ skipping 84 matching lines @@
   AddChildViewAt(view, real_index);
   if (GetContentsBounds().IsEmpty())
     return;
 
   adding_views_.insert(view);
   DoUpdateIfPossible();
 }
 
 void MessageListView::RemoveNotification(MessageView* view) {
   DCHECK_EQ(view->parent(), this);
+
+
   if (GetContentsBounds().IsEmpty()) {
     delete view;
   } else {
+    if (adding_views_.find(view) != adding_views_.end())
+      adding_views_.erase(view);
+    if (animator_.IsAnimating(view))
+      animator_.StopAnimatingView(view);
+
     if (view->layer()) {
       deleting_views_.insert(view);
     } else {
-      animator_.StopAnimatingView(view);
       delete view;
     }
     DoUpdateIfPossible();
   }
 }
 
 void MessageListView::UpdateNotification(MessageView* view,
                                          const Notification& notification) {
   int index = GetIndexOf(view);
   DCHECK_LE(0, index);  // GetIndexOf is negative if not a child.
@@ skipping 343 matching lines @@
         base::TimeDelta::FromMilliseconds(
             kAnimateClearingNextNotificationDelayMS));
   }
 }
 
 void MessageListView::SetRepositionTargetForTest(const gfx::Rect& target_rect) {
   SetRepositionTarget(target_rect);
 }
 
 }  // namespace message_center